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Surface XPS-investigations of tobacco leaves treated with low-temperature plasma 被引量:1
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作者 shao guo-quan HUANG Huan +4 位作者 HONG Shen-Qiu FU Sheng-Quan LI Sheng-Qun YAO Zhong-Da LI Chang-Xing 《Nuclear Science and Techniques》 SCIE CAS CSCD 2006年第4期212-216,共5页
The tobacco leaves were treated with low-temperature plasma in Ar, N2, O2, and air atmospheres at different powers (60―130 W). The surface-elemental components, their relative contents, and the functional groups of t... The tobacco leaves were treated with low-temperature plasma in Ar, N2, O2, and air atmospheres at different powers (60―130 W). The surface-elemental components, their relative contents, and the functional groups of the surface components of the tobacco leaves were determined using XPS (X-ray photoelectron spectroscopy). The ex- perimental results showed that the percentage of the elements C, N, and O had changed considerably and a large number of polar functional groups containing oxygen atoms were incorporated into the components on the tobacco surfaces. The measurements of the surface contact angle showed that the surface contact angle of the modified tobacco leaves was 0 degree, whereas it was 110 degrees before the plasma treatment. These results indicate that the wettability of the modified tobacco leaves improved dramatically. This work may be significant for future researches on the surface modification of the tobacco leaves. 展开更多
关键词 烟草 叶片处理 低温等离子体 X射线光电子光谱学 表面形态
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Synthesis and Crystal Structure of 3,6-Bis(4,4,4-trifluorobutane-1,3-dione)-9-n-butylcarbazole
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作者 YANG Lina ZHAO Xiang-Hua +5 位作者 ZHOU Hong-Ping WU Jie-Ying YANG Jia-Xiang shao guo-quan CHENG Le-Hua TIAN Yu-Peng 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2008年第2期143-148,共6页
A novel bis(β-diketonate) derivate, 3,6-bis(4,4,4-trifluorobutane-1,3-dione)-9-n- butylcarbazole 1, was synthesized and structurally characterized by single-crystal X-ray diffrac- tion. The crystal belongs to the... A novel bis(β-diketonate) derivate, 3,6-bis(4,4,4-trifluorobutane-1,3-dione)-9-n- butylcarbazole 1, was synthesized and structurally characterized by single-crystal X-ray diffrac- tion. The crystal belongs to the monoclinic system, space group P2 1/c with a = 10.961(6), b = 22.942(13), c = 9.408(6)A, α = 90, β = 109.663(9), y = 90°, V = 2228(2)A^3, Z = 4, Dc = 1.489 g/cm^3, C24H19F6NO4, Mr = 499.40, F(000) = 1024 and μ = 0.134 mm^-1. The structure was refined to the final R = 0.0699 and wR = 0.1627 for 3744 independent reflections (Rint = 0.1288) and 1349 observed reflections (I 〉 2σ(I)). Compound 1 consists of carbazole unit and two terminal diketonate groups, in which carbazole and its two adjacent diketonate rings are almost coplanar. Moreover, compound 1 was characterized with IR, elemental analysis, IH NMR, MS, electronic absorption, and single-photon fluorescence. 展开更多
关键词 crystal structure bis(β-diketonate) carbazole derivates synthesis characterization
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植物生长调节剂对根及根茎类药材质量影响的研究进展 被引量:10
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作者 张腾腾 钱心悦 +5 位作者 孙俊杰 任明军 汤瑜晨 张小倩 邵国泉 胡云飞 《中国新药杂志》 CAS CSCD 北大核心 2022年第8期752-761,共10页
植物生长调节剂是一类具有与植物激素类似生理和生物学效应的物质,常用于农作物生产增产。随着近年来中医药的发展,植物生长调节剂在中药材栽培中被无序使用甚至滥用,进而导致中药材品质下降,临床上还会出现“方灵药不灵”的现象,其残... 植物生长调节剂是一类具有与植物激素类似生理和生物学效应的物质,常用于农作物生产增产。随着近年来中医药的发展,植物生长调节剂在中药材栽培中被无序使用甚至滥用,进而导致中药材品质下降,临床上还会出现“方灵药不灵”的现象,其残留量也会产生极大的安全隐患。本文从植物生长调节剂对根及根茎类药材的性状、产量、内在成分及其残留量的检测与危害等方面进行阐述,提出及时摸清目前根及根茎类药材中植物生长调节剂的使用情况,实行中药栽培过程中植物生长调节剂使用登记制度,做好合理应用等相关农业推广,尽快制定植物生长调节剂残留限量标准的建议,以期确保临床用药安全、有效。 展开更多
关键词 植物生长调节剂 根及根茎类药材 质量影响 研究进展
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